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Protein and Protein Structure02:15

Protein and Protein Structure

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
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In any system of units, the units for some physical quantities must be specified through a measurement process. These measurements are the base quantities of the system, and their units are the base units of the system. The algebraic combinations of the base values can then be used to express all other physical quantities. Each of these physical quantities is then referred to as a derived quantity, with each unit being referred to as a derived unit.
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Incorporating Target Protein Structure Flexibility and Dynamics in Computational Drug Discovery Using Ensemble-Based Docking Analysis
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Refining protein structures using enhanced sampling techniques with restraints derived from an ensemble-based model.

Tianqi Ma1, Tianwu Zang1, Qinghua Wang2

  • 1Applied Physics Program and Department of Bioengineering, Rice University, Houston, Texas, 77005.

Protein Science : a Publication of the Protein Society
|August 12, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a new protein structure refinement method, Parallel Continuous Simulated Tempering with Ensemble-Based Models (PCST-EBM). This advanced technique significantly improves low-accuracy protein models, enhancing structural prediction accuracy.

Keywords:
empirical potentialenhanced samplinghigh-accuracy refinementstructure prediction

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Area of Science:

  • Computational Biology
  • Structural Biology
  • Biophysics

Background:

  • Accurate protein structure determination is crucial for understanding biological function.
  • Existing protein structure refinement methods have limitations in improving low-accuracy models.

Purpose of the Study:

  • To develop and validate a novel, high-accuracy protein structural refinement method.
  • To enhance the quality of protein models by leveraging structural ensembles.

Main Methods:

  • The study extends the Parallel Continuous Simulated Tempering (PCST) method.
  • An Ensemble-Based Model (EBM) replaced single-reference restraints, utilizing multi-Gaussian functions derived from structural ensembles.
  • A temperature-dependent restraint and blind model selection scheme were employed.

Main Results:

  • The PCST-EBM method was tested on 18 targets from CASP10, CASP11, and CASP12 refinement categories.
  • In the Top-1 group, 11 out of 18 targets achieved better models (higher GDT_TS scores) than CASPR participants.
  • In the Top-5 group, 9 out of 18 targets showed improved models.

Conclusions:

  • The PCST-EBM method demonstrates significant capability in improving low-accuracy protein structures.
  • This approach effectively utilizes ensemble information to enhance structural refinement accuracy.
  • The findings suggest a promising direction for future protein structure prediction and refinement research.